A subset of credit card holders use them extensively and strategically to gain rewards.
They tend to be very savvy, know all the rules and angles, and can eat away at a bank's profits.
Now, Business Insider reports that some card issuers, like JPMorgan Chase, are onto them.
Reports suggest Chase may be taking a harder line with credit-card gamers who open too many accounts.
As such, they're closing the accounts of so-called 'super users.'